CVE-2026-89504 (GCVE-0-2026-89504)
Vulnerability from cvelistv5
Published
2026-09-11 19:43
Modified
2026-10-19 08:47
Severity ?
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: regulator: as3722_get_regulator_dt_data: fix premature of_node_put leaving dangling of_node pointer In as3722_get_regulator_dt_data(), of_get_child_by_name() acquires a reference on np, which is then assigned to pdev->dev.of_node. The function immediately calls of_node_put(np), releasing the reference and leaving pdev->dev.of_node as a dangling pointer. Remove the of_node_put(np) call to let the device hold the reference.
References
Impacted products
Vendor Product Version
Linux Linux Version: bc407334e9a6a745de5360395282beb2690adf48
Version: bc407334e9a6a745de5360395282beb2690adf48
Version: bc407334e9a6a745de5360395282beb2690adf48
Version: bc407334e9a6a745de5360395282beb2690adf48
Version: bc407334e9a6a745de5360395282beb2690adf48
Version: bc407334e9a6a745de5360395282beb2690adf48
Version: bc407334e9a6a745de5360395282beb2690adf48
Version: bc407334e9a6a745de5360395282beb2690adf48
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{
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          "programFiles": [
            "drivers/regulator/as3722-regulator.c"
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              "version": "0",
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nregulator: as3722_get_regulator_dt_data: fix premature of_node_put leaving dangling of_node pointer\n\nIn as3722_get_regulator_dt_data(), of_get_child_by_name() acquires a\nreference on np, which is then assigned to pdev-\u003edev.of_node. The\nfunction immediately calls of_node_put(np), releasing the reference and\nleaving pdev-\u003edev.of_node as a dangling pointer.\n\nRemove the of_node_put(np) call to let the device hold the reference."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The dangling of_node is created only on the local as3722-regulator platform probe path (I2C MFD as3722_i2c_probe \u2192 mfd_add_devices \u2192 as3722_regulator_probe \u2192 as3722_get_regulator_dt_data); the onboard AMS AS3722 PMIC is not reached via network packets, Bluetooth, or USB enumeration.\nAC:L - On affected Tegra boards the required regulators DT child exists, so of_get_child_by_name() then the premature of_node_put() runs deterministically at every probe with no race; with OF_OVERLAY (arm64 defconfig) the node can be freed while the device still holds the pointer.\nPR:N - tegra_defconfig builds MFD_AS3722 and REGULATOR_AS3722 in, so the vulnerable probe runs automatically at boot on Chromebooks (nyan), Jetson TK1, Toradex Apalis, and similar embedded systems with no capability check; an attacker only needs to power-cycle a shared kiosk or device.\nUI:N - Driver initialization and the of_node_put() run unattended during kernel boot on affected hardware; no victim action such as mounting a filesystem, opening a device, or plugging in USB is required.\nS:U - The use-after-free corrupts kernel device_node/kobject memory on the host; AS3722 is a board PMIC regulator driver and does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - The premature of_node_put() leaves pdev-\u003edev.of_node dangling; a later put on device release or DT overlay teardown can free the device_node while the driver and OF core still use it, enabling reads of reallocated slab memory.\nI:H - Use-after-free of the device_node heap object (kobject, fwnode, property and parent/child links) can be turned into an arbitrary write and control-flow hijack via heap reuse, matching scoring guidance that UAF is Integrity High.\nA:H - Dereferencing the dangling of_node during regulator registration, sysfs, overlay removal, or platform_device_release() can oops or panic the kernel, including at boot on systems where AS3722 supplies CPU and core rails."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:47:55.766Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d9b1407477fb736978b04108073180ca84958936"
        },
        {
          "url": "https://git.kernel.org/stable/c/bd5606e9da1a01a61c7d2f5df36243414a0142be"
        },
        {
          "url": "https://git.kernel.org/stable/c/0bde4f140e90f87ebd49cd9c884c4bb3f19fe931"
        },
        {
          "url": "https://git.kernel.org/stable/c/eda08b6bd64f01ca9defbfcc9e0c3e30f46cfc02"
        },
        {
          "url": "https://git.kernel.org/stable/c/d3c1316d84e0a036890b00ae6e4c0b0b80f70c25"
        },
        {
          "url": "https://git.kernel.org/stable/c/95342d26f9c6b68a46ab57fa48428a3c4a423dd7"
        },
        {
          "url": "https://git.kernel.org/stable/c/8648e29e5c01b6b677c704049189287e27255ccb"
        },
        {
          "url": "https://git.kernel.org/stable/c/f9324d670ae0b88cbfb0aa48fcaefa5baeb8da4c"
        }
      ],
      "title": "regulator: as3722_get_regulator_dt_data: fix premature of_node_put leaving dangling of_node pointer",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89504",
    "datePublished": "2026-09-11T19:43:52.024Z",
    "dateReserved": "2026-09-11T19:38:34.715Z",
    "dateUpdated": "2026-10-19T08:47:55.766Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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